Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 20.6, Problem 2R
Summary Introduction
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The event that will result in significant and sudden changes, across many species simultaneously during natural selection.
Introduction:
Natural selection is the mechanism of passing beneficial traits essential for survival and adaptation of an organism with time. There are various changes, which occur in species and their alleles due to evolution. These changes occur over the time. These changes can be specification wise and also quantity wise. There are two types of changes, which are often seen are microevolutionary and macro-evolutionary changes.
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Over many generations, there is a good chance that an advantageous gene will be shared by every organism of the same species or that a new species will emerge. These long-term outcomes are called:
population
evolution
hybridization
adaptation
Describe how natural selection can create new species through reinforcement.
A species is a group of individual organisms that interbreed and produce fertile, viable offspring. According to this definition, one species is distinguished from another when, in nature, it is not possible for matings between individuals from each species to produce fertile offspring. Evolution is an important mechanism in the formation of new species. The evolution of a new species requires several components including all, BUT
A) Evolution of a new species requires a long time.
B) Evolution of a new species requires the need for a genetic change.
C) Evolution of a new species requires a separation that prevents interbreeding.
D) Evolution of a new species requires mutations that produce new genetic traits.
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Life: The Science of Biology
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- Which of the following statements is not true about the concept of natural selection? Group of answer choices A-Geographical isolation contributes to the formation of new species as individuals begin to adapt to different environments B-Natural selection explains the increase in the yield of kernels per corn plant over the last several thousand years C-Infers that later generations may be distinct from ancestral ones, or a new species can appear D-Selective pressures cause distinct species to develop E-Suggests that over long periods of geological time, successful variations accumulate in a populationarrow_forwardThe biological species concept is based on the assumption that species are reproductively isolated and do not share genes. And yet a number of organisms that are considered different species hybridize (mate and exchange genes). Hybridization between different species is more common in plants than in animals. Propose some possible reasons for this difference.arrow_forwardDo you expect that natural selection acting within a species would increase the population size of the species? Do you expect that it would increase the rate at which new species arise, thus increasing the number of species?arrow_forward
- Consider the graph below. This is an example of whatkind of natural selection? Directional selection Diversifying selection Stabiizing selection Disruptive selectionarrow_forwardDescribe how the effects of genetic drift and natural selection can interact in a subdivided species.arrow_forwardWhat is the relationship between changes in gene frequencies and adaptations? The change in genes results in adaptations, which in turn, lead to the individual's ability to survive in its environment. The change in genes reduces adaptations, limiting the individual's ability to adapt for survival. The change in genes speeds up the process of adaptations, and the result is adaptations within any species will occur within a year. The change in genes results in adaptations in the individual, but these adaptations cannot be passed on to future generations.arrow_forward
- Which part of these statements isn't right ? A species is a group of organisms that can potentially interbreed with one another to produce viable, fertile offspring. Speciation is when two new species form from one original one. Sympatric speciation occurs when there is a geographic separation of a population. Allopatric speciation occurs while the population remains in the same area. Adaptive radiation occurs when one species evolves into many to fill several different niches. Natural selection requires traits to be passed from parent to offspring, more offspring are produced than can survive creating competition, and inherited traits vary among offspring. Fossils, Anatomy and embryology, biogeography, and molecular biology all provide support for the theory of evolution. Evolution can be driven by many different things. Mutations are changes in DNA that create new alleles in a population. Gene flow is the flow of alleles in and out of a population resulting from the migration…arrow_forwardConsider the graph below. This is an example of whatkind of natural selection? h Directional selection Diversifying selection Stabiizing selection Disruptive selectionarrow_forwardWhile creation and presence of variation is directionless, natural selection is directional as it is in the context of adaptation. Commentarrow_forward
- Please provide abd explain four example of hybrid zone in animals . How large is the area of hybridization. What prezygotic isolating mechanism prevent the species from interbreeding outside the hybrid zone. is the frequency of hybrid matings increasing or decreasing through time.arrow_forwardDescribe the concepts of natural selection, including differential reproduction, mutations, Hardy-Weinberg equilibrium, speciation, and punctuated equilibrium).arrow_forwardPlace the steps of natural selection in sequential orderarrow_forward
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Discovering the tree of life | California Academy of Sciences; Author: California Academy of Sciences;https://www.youtube.com/watch?v=AjvLQJ6PIiU;License: Standard Youtube License